<template>
  <view>
    <view class="search-box">
      <!-- 使用 uni-ui 提供的搜索组件 -->
      <uni-search-bar focus @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    
    <!-- 搜索建议项 -->
    <view class="sugg-list" v-if="searchSuggestion.length !== 0">
      <view class="sugg-item" v-for="(item, i) in searchSuggestion" :key="i" @click="gotoDetail(item.goods_id)">
        <view class="goods-name">
          {{item.goods_name}}
        </view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag type="warning" circle :text="item" v-for="(item, i) in historyList" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    onLoad() {
      this.historyList=JSON.parse(uni.getStorageSync('kw')) || []
    },
    data() {
      return {
        timer:null,
        kw:'',
         // 搜索建议数据列表
        searchSuggestion: [],
        // 搜索关键词的历史记录
        historyList: []
      };
    },
    methods:{
      input(e){
        clearTimeout(this.timer)
        this.timer=setTimeout(()=> {
      // 如果 500 毫秒内，没有触发新的输入事件，则为搜索关键词赋值
      this.kw = e
      // 根据关键词，查询搜索建议列表
      this.getSearchList()
        }, 500);
      },
     async getSearchList(){
        if(this.kw.trim()===''){
          this.searchSuggestion=[]
          return
        }
        // 发起请求，获取搜索建议列表
          const { data: res } = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw })
          if (res.meta.status !== 200) return uni.$showMsg()
          this.searchSuggestion = res.message
          // 1. 查询到搜索建议之后，调用 saveSearchHistory() 方法保存搜索关键词
          this.saveSearchHistory()
      },
      saveSearchHistory(){
        const isInclude=this.historyList.includes(this.kw)
        if(isInclude) return
        this.historyList.unshift(this.kw)
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      gotoDetail(goods_id){
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + goods_id
        })
      },
      cleanHistory(){
        this.historyList=[]
        uni.setStorageSync('kw','[]')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    }
  }
</script>

<style lang="scss">
.search-box{
    position: sticky;
    top: 0;
    z-index: 999;
  }
  .sugg-list{
    padding: 0 5px;
    .sugg-item{
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;
      display: flex;
      justify-content: space-between;
      align-items: center;
      .goods-name{
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
  }
  .history-box{
    padding: 0 5px;
     .history-title{
       display: flex;
           justify-content: space-between;
           align-items: center;
           height: 40px;
           font-size: 13px;
           border-bottom: 1px solid #efefef;
     }
      .history-list{
        display: flex;
        flex-wrap: wrap;
        uni-tag{
          margin-top: 5px;
          margin-right: 5px;
        }
      }
  }
</style>
